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A250531 Number of (n+1)X(3+1) 0..3 arrays with nondecreasing max(x(i,j),x(i,j-1)) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction 1
3958, 44017, 393910, 3091263, 21783369, 142934266, 885728348, 5269466799, 30337133947, 170444570767, 938858272263, 5094247207831, 27305253854913, 144985807285630, 763985644924271, 4002062352221853, 20864575519057800 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A250536
LINKS
FORMULA
Empirical recurrence of order 65 (see link above)
EXAMPLE
Some solutions for n=2
..1..1..2..3....0..0..1..3....0..3..1..3....0..1..1..2....0..0..2..2
..3..2..2..3....1..1..1..3....3..1..3..3....0..1..1..3....1..1..2..2
..0..3..3..3....3..3..3..1....0..3..3..3....0..2..1..3....0..2..1..2
CROSSREFS
Sequence in context: A059666 A230707 A230617 * A319800 A034599 A007038
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 24 2014
STATUS
approved

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Last modified December 9 09:03 EST 2023. Contains 367690 sequences. (Running on oeis4.)